Grease gun



Dec. 9, 1930. P. GREssL-:R 1,784,434

GREASEGUN Filed March 15. 1928 2 Sheets-Sheet l I I j? /7 /7' LT l :Z0 '75-. i y I l i, j', j Ai I 5 f l j lf" 'ini 3l l i /f l l /2 t Z0 z 2,5/9 ,ZZ |;.i y l' v i I 1 l l f1 Af/ /3 l j; l l Y.

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Feier E'z-'Esser P. GRESSER Dec. 9, 1930.

GREASE GUN Filed March l5. 1928 2 Sheets-Sheet 2 Grifoni/w13 yPatented Dec. 9, 1930 y UNITED STA PETERGaEssER, or DETROIT,` MICHIGAN l .GREASE GUN .Application led March 15, 1928. Serial 110.261.985..

YThe present invention pertainsl to a` novel 'grease gunadapted for the lubrication of bearings such as, for example, the bearings of armotor vehicle. 4

'The principal objectof the invention is to y.provide a rdevice'ofthis character capable of deliveringa predetermined or constant amount of lubricant on each operation. In the accomplishmentpof vthis object, the

1@body orr'eceiver ofthe device'is in the form ofa cylinder having a piston slidably mounted therein.V One sideof the piston forms a chamber for containing the lubricant7 and at the other side yis mounted a spring which causesthe pistonto exert pressure constantly on the lubricant. An'outlet pipe disposed axially of the lcylinder is incommunieation with'the lubricant chamber, and therefore receives lubricantrtherefrom under pressure.

vAn ejectingy plunger moves in the outlet tube,` within certain limits, and thus measures the amount of lubricant whichfmay be stored in' theoutlet tube in advance :of the plunger. The plunger has a'y check valve controlled passage permitting the lubricant to lowin front of theplunger, and ythis valve is adapted to close when the plunger is moved for thek purpose of expelling the lubricant. A further .feature of the invention resides in'thenozzle of the outlet tube, which is normally closed vby a spring pressed check valve. A special fitting is designed for application at the part to be lubricated,- and wheny the nozzle Vis connected tothe Vfitting, the valve 5 is. opened.' Preferably,l a locking means is provided betweenthe fitting and the nozzle to maintain the proper relation and communicaltion between these parts. y The fitting also may be normallyclosed by a check valve, and in such case,.this valve is opened by a stem extending from theV check valve in thenozzle, when the nected. y v

Y The -kinvention'is fully disclosed by way of example in the following description and in the accompanying drawings, in which- Figure 1 is a longitudinal section ofthe device; s 59 Fig. 2 is asimilar section on the line 2-.r2

partsv are properly conof Figure 1 and showing the devicearranged for discharging 5,

Fig. 3 is a transverse section on the line 3 3 of Figure 1; n.

Fig. 4 is a similar sectionon the line 4-4 of Figure 1; l

Fig. 5 is a similar section on the line 5'-5 of Figurel;k j` f I; ig. 6 is a bottom plan view of vthe gun; anc

Fig.` Z is a. longitudinal section of a modi-y fied construction. Reference to these views will now be made by use of like characters which are employedv to designate corresponding parts throughout.

The body of the device is in the form ora cylinder. 1 having its lower end open and flared as indicatedby the numeral 2. This end is formed with a series or bayonet slots 3 and is lined with a ring 4 which constitutes a packing for said opening.

' Over the flared open end is iitted a cap 5 having studs 6 received in the bayonet slots as 'clearly shown in I `iguresv 1 and 7. 'I he cap is further formed with `a .number of ports 7 and with a downwardly extendingl central boss 8 into which is litted the lower end of an outlet tube 9. This tube is disposed axially of the cylinder and extends nearly to the vupper end thereof. Into the lower end of the tube is fitted a liner lOf'having slots 11 near the upper end thereof. In the tube is also mounted an axial stem 12 carrying at its upperend 'a spider 13'. The stem is surrounded by a spring 14 bearing against the spider 13 andthe upper end of the liner 10. An internally flanged ring 15 screwed on the upper-end ofthe tube 9v prevents the spider from being expelled from the tube by the spring.

T o the lower end of the stem is attached an ejecting plunger 16 having'a sliding nt in the liner 10; `When the plunger is retracted to its innermost p0sition,-as in vFigure l, itis :ifi

still within the liner 10, so that ythis kliner and the'spider 13 serve'as guid'emembers vwhich maintain the stem 12 axially ofthe tube 9. In the topofthev cylinderv 1 islitted a gland .17 throughwhich slidesfa rod 18 having at its kthe tube 9. The other compartmentcontains'y a spring 24 bearing agalsbthwpistonfhtu" Y When the stem retracted to their normbr'infermst poshy slots 1. 'J Thisfprovides e i 2t) in* closing maintain the lubrlcant yin the chamber 22 under pressure.V Y t V` 12 and the plungerl are anot er me'ansffof 4 communication' from one c Y Y sdfe'eftlie plunger y toM the other is provided;

' i3()v l i phifnge contains awspri'ng 27 for, the' pur-J pose ofmaintainingia hall valve 28 norlnally yrelation tothe passage'a25a AThis springhoweverfis ,not of s'ufli'cicnt*strengtl'x` togresiststhef pressure on the lubricant' caused i ythreaded anozzleofihetween whichlandt e endof theliner'I'Ois clamped another spider V311i',s'tifffml3`2llisxsone en'dfixedffto this V Ispider and'therotlielfv,end1 formed with a valveFhead f 33';` The stein a reduced extension 134 on the?? other; side `of the stern for the .f purpose Y resientlK ftobe defseribedfy A va-lye seat-mem-A i n35 shdesfwithin-the nozzle and is adapted toclseupqn therhead 33'fwlien iniits outermoetv` ition:

between liefs/piu@ flugafzbviwslyfgmt di@ -fronibeingfexpel n through c y epart tobe lubrcate is eqippedfwith u Timun Aif! ma www-Mex is being -f Si'ves the ball valve-44 from its sea-t, in-

l bearing,v

the latter by means ofits facets is caused to pass between the lugs 39. In doing so, pres-r sure on thel cylinder or body of the grease n t is required to overcome thesprin 36, anilt Y the same time fthe valve seat mem er 35 is' removed from the head 33by the lifting disk 37 which directly engages 4the fitting, The' mare thus locked inthe deeper parts of the t. 1,; 47. Whilethe nozzle pushed over the Vfitting, the extension asmuch asA the yextension isV of such'length as in Figure 2.,`

tion offthe plunger` 16 inthe tube Y9. Consequeutl'ygfthe volume of 'li'lbric'ant contained inx'th'e line' 'IQwher'thesprng is expanded mit@ waser48-anhfiwa fifanwdnrmne Fora similar reason thefvalvegseat-Amember afgt hroughethelnoznleg'whenf,.dehveryfofll;

retrwed'feed; charge of..mpriggneh bgszinjmalinw a thegunffwithfmwnftrewthe bearings?.-V Itv nillfbewthat'thelw 40' scribedfebhuwwwmisielowemdofaritY linerfisl formedwitbfareonieglivalyeseat-JLS.

diewmff weaumaesuyaoefunrfimheaiw 10 andit is, desirable 'that the lowera'u! crowds@ the filling of the liner with lubricant w en? b Saly, omited within theseat f parent that under these conditions the valve 50 will close firmly against thel seat 49 and will thereby improve the closure of the liner to the atmosphere.

Although specific embodiments of the invention have been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

What Iclaim is l. A- grease gun comprising a cylinder forming a pressure chamber, an outlet tube in communication with said chamber, a liner disposed in said tube near the outlet end thereof and extending into said cylinder, said liner being slotted at a point considerably inward of the forward end of said cylinder, a plunger slidable within said liner along the slotted portion thereof and adapted to obstruct said liner beyond said slotted portion.

2. A grease gun comprising a cylinder forming a. pressure chamber, an outlet tube in communication with said chamber, a liner disposed in said tube near the outlet end thereof and extending into said cylinder, said liner being slotted at a point considerably inwardof the forward end of said cylinder, a plunger slidable within said liner along the slotted portion thereof and adaptedto obstruct said liner beyond said slotted portion, said plunger having a passage therethrough permitting communication from one side thereof to the other, and a check valve controlling said passage and adapted to close on the ejection stroke.

3. A grease gun comprising a cylinder forming a pressure chamber, an outlet tube in communication with said chamber, a liner disposed in said tube near the outlet end thereof, said liner being slotted at its inner cnd,a plunger slidable within said liner along the slotted end thereof and adapted to obstruct said liner beyond said end.

4. A grease gun comprising a cylinder forming a pressure chamber, an outlet tube in communication with said chamber, a liner disposed in said tube near'the outlet end thereof, said liner being slotted at its inner end, a plunger slidable within said liner along the slotted end thereof and adapted to obstruct said liner beyond said end, said plunger having a passage therethrough permitting communication from one side thereof to the other, and a check valve controlling said spring disposed in one of said compartments and acting on said piston, an outlet tube extending a considerable distance into said cylinder and communicating with the other compartment, said tube having its outlet end disposed exteriorly of said cylinder, said tube passing through the piston and permitting sliding movement of the latter thereon, a liner disposed in said tube near the Voutlet end thereof and extending into said cylinder,

extending to the exterior of. said cylinder,

said tube passing through the piston and said piston being slidable on said tube, an ejecting plunger slidably mounted in the tube, and means for communicationfrom one side of said plunger to the other side,'within the tube, said plunger being adapted to obstruct said means.

In testimony whereof I aix my signature. i

PETER GRESSER. 

